Quick detachable coupling



Apr-i129, 1947. F. A. BARNES QUICK. DETACHABLE COUPLING Filed Aug. 5, 1944 a W T: R. m 0 WM m a L K m r aw pm.

Patented Apr. 29, 1947 UNITED STATES PATENT OFFICE QUICK DETACHABLE COUPLING Frederick A. Barnes, Cleveland Heights, Ohio Application August 5, 1944, Serial No. 548,175

2 Claims.

This invention relates to a quick detachable coupling for connecting together generally cylindrical parts and is particularly useful for providing a leak-proof joint between tubular ends.

It is an object of the present invention to provide a quick detachable coupling which consists of a minimum number of parts adapted to be easily machined out of bar stock and one which provides a very positive and dependable connection.

The construction and advantages of my improved device will be apparent from the accommanying description, and the essential features will be summarized in the claims.

In the drawings,

Fig. 1 is a side elevational view of one form of my coupling device;

Fig. 2 is an exploded view of the parts of Fig. l

Fig. 3 is an enlarged transverse sectional view taken along the line 3-3 of Fig. 1;

Fig. 4 is a sectional view taken along the line 44 of Fig. 3;

Fig. 5 is a transverse sectional View enlarged taken along the line 55 of Fig. 1; while Fig. 6 is a transverse sectional view taken on the line 6-6 of Fig. l.

While some of the features of my device are adaptable for connecting solid or tubular parts for various purposes, I have chosen to illustrate the same as used for connecting two generally cylindrical tubular parts such as are found, for instance, in a compressed air line. By this illustration, however, I do not intend to limit the use of my device.

In the various views, It] and I I represent the two parts to be coupled while I2 is the coupling sleeve. The part Ill has an enlarged cylindrical portion Illa which carries the coarse thread IOb. At it coupling end, the part I 9 has diametrically opposed ears Ific extending parallel to the axis of the member I I and toward the other part I I which is to be coupled.

The part II has an enlarged cylindrical portion Ila terminating in a flange IIb extending radially outwardly and interrupted to provide the diametrically opposed recesses II c which are adapted to receive the tongues Iflc in a relatively snug fit. When the parts Ill and II are to be coupled, the tongues I90 and the recesses IIc coact to provide means for preventing relative rotation between the parts In and II when the coupling action takes place.

The sleeve I2 is provided with an internal thread I2a adapted to coact with the thread Iflb. At the end of the sleeve nearer the part I I, there are provided two lugs I2b extending radially inwardly at diametrically opposite points and adapted to lie on that side of the flange IIb farthest away from the abutting ends of the coupling as clearly shown in Fig. 4. These lugs are adapted to pass through the recesses I I0.

It results from the above-described construction that when the parts III and I I are placed with their ends abutting as shown in Fig. 4,- the tongues I Go enter the recesses H0 and prevent relative rotation between the parts I0 and II. The sleeve I2 has already been threaded so as to engage the threads 10b and I2a. The part H is moved into abutting engagement with the part It by passing the flange IIb into the right-hand end of the sleeve I2 as shown in Figs. 2 and 4, this movement being possible because the lugs I 2b are adapted to pass through the recesses I I0. With the parts in the position of Fig. 4, relative rotation is produced between the sleeve I2 and the interengaged parts ID and I I which are compelled to rotate as a unit because of the engagement of the tongues I00 in the recesses No. This rotation of sleeve I2 in a direction to cause the interengaging threads to move the part II] toward the part II causes a firm engagement between the abutting ends of the parts I0 and II because the lugs I2b now lying behind the flange I Ib prevent movement of the part II away from the part I0. In actual practice, a very slight rotation of sleeve I2 serves to firmly connect the parts It] and II.

While it would be possible to provide a machined joint between parts I0 and II, for some purposes I prefer to provide a sealed joint at this point for the handling of compressed air or other fluids. To this end, as best shown in Figs. 4 and 5, I insert annular gaskets I3 of natural or synthetic rubber or other suitable sealing material in proper seats in the abutting ends of the parts I0 and I I. Then when the parts are coupled as previously described, the abutting gaskets I3, which project beyond the metal parts I0 and II as shown in Fig. 4, are forcibly compressed together to provide a leak-proof joint at this point.

Preferably I utilize a cheaply constructed device for holding the parts I0 and I2 in more or less permanent engagement so that when the part I0 is connected to one hose and the part II to another, there are no loose parts to be lost. This means for securing the parts I0 and I2 together consists in the striking out and peening over a small tongue I20 from the metal of sleeve I2 at the end of the sleeve near the shoulder of the portion Illa so that the tongue I20 prevents unscrewing of the part III out of the sleeve I2.

Preferably, also, I mill out a portion of the thread 10b as shown in Fig. 6 to provide a shoulder M so arranged with respect to the tongue I20 that when the part II] is screwed out of the sleeve l2 until the shoulder l4 strikes the tongue I20, the tongues I00 will be aligned with the lugs 12b so that as the part II is moved endwise into the sleeve 12, the recesses He will first pass over the lugs I21) and then into engagement to receive the tongues lilo. Thus the shoulder l4 and the tongue 12c serve to automatically position the parts for easy engagement after which the minimum rotation of sleeve !2 couples the parts In and l I. Knurling may be provided if desired on the outside of sleeve l2 to aid in its rotation.

The screwing of the part it! into and through the sleeve I2 is possible to only a limited extent and is hindered when one of the tongues Hic strikes one of the lugs l2b. I have thus prevented loss of any of the parts when the device is connected to the ends of a hose to be coupled or in any similar application.

Note that my improved coupling may not be accidentally disconnected as by dragging of a compressed air hose over the floor. Note also that I do not rely upon a packing adapted to be expanded by the compressed fluid but instead I use a packing or sealing material [3 which is positively compressed by the parts of the coupling.

What I claim is:

1. In a quick detachable coupling, two tubular parts to be coupled in axial alinement with their ends abutting, said parts having their inside diameters equal, an annular flange extending radially outwardly near the end of a first of said parts, there being a plurality'of recesses extending axially through said flange and opening radially outwardly of said flange and spaced regularly about its circumference, a plurality of tongues extending from the end of a second of said parts substantially parallel to its tubular axis and adapted to enter said recesses when said ends abut, a sleeve surrounding said abutting ends, said sleeve having an internal diameter snugly embracing the outer circumference of said flange, interengaging threads on said sleeve and said second part, and a plurality of lugs extending radially inwardly from said sleeve and adapted to pass through said recesses to lie in back of said flange, whereby with said tongues, lugs and recesses alined said ends may be placed in abutting relation with said lugs on the side of said flange away from said abutting ends, and rotation of said sleeve will move said abutting ends tightly together, after which said sleeve prevents angular play of said first part relative to said second part.

2. The combination of claim 1 including coacting stop means on the end of said sleeve removed from said lugs and on the end of said threaded second part farthest from said abutting ends, said stop means effective upon backing off the sleeve on the threads of said second part to aline said tongue with said lugs.

FREDERICK A. BARNES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,238,218 Thompson Aug, 28, 1917 809,746 Rhoads Jan. 9, 1905 

